Inflated spatula

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Inflated spatula
Inflated spatula (Thracia convexa) (from Wood, 1815: plate 18, fig. 2 [1])

Inflated spatula ( Thracia convexa ) (from Wood, 1815: plate 18, fig. 2)

Systematics
Superordinate : Anomalodesmata
Order :
Superfamily : Thracioidea
Family : Spatula clams (Thraciidae)
Genre : Thracia
Type : Inflated spatula
Scientific name
Thracia convexa
( W. Wood , 1815)

The puffed up spatula clam ( Thracia convexa ) is a type of clam from the family of spatula clams (Thraciidae).

features

The slightly unevenly folded, heavily expanded housing is up to 70 mm long. The right flap is slightly larger than the left flap and also more arched. The casing is unequal, the vertebrae sit a little behind the center line. The vertebrae are arched back and inwards. The vertebra of the left valve sits in a hole at the base of the vertebra of the right valve. The outline is somewhat irregularly triangular and slightly drawn out towards the rear. The case has a slight gap in the rear; the siphons can be stretched out when the flaps are closed. Nordsieck gives the ratio of length to height to thickness with 50 mm to 40 mm to 25 mm. The posterior dorsal margin drops off steeply and is slightly concave. The rear edge is tightly rounded. The anterior dorsal margin drops off a little less steeply, but is straight to slightly convex. But it rises higher than the posterior ventral margin. The leading edge is tightly rounded. The ventral margin is almost straight. A weak, smooth keel runs from the vertebra to the posterior end of the ventral margin. The ligament lies internally and externally. The external ligament is a short dark brown band behind the vertebrae. The internal ligament sits in a narrow ligament pit on a short resilifer under the external ligament. The ligament pit of the right valve is slightly deeper than that of the left valve. The lithodesm is very small, thin and often broken off. The mantle bay is comparatively shallow and more rounded, triangular in shape. The jacket bay extends for about a third of the total length. The posterior sphincter is thick and rounded-triangular. The anterior sphincter, on the other hand, is long and thin.

The whitish, less often cream-colored skin is thin and fragile. The ornamentation consists of growth lines parallel to the edge. These are somewhat coarser in the rear part of the housing (behind the keel). The surface is finely grained. The periostracum is pale brown to beige, also yellowish to greenish-yellowish. The inner edge of the case is smooth. The inside is white.

Similar species

The inflated spatula ( Thracia convexa ) is significantly shorter and taller than the long spatula ( Thracia pubescens ). The posterior dorsal margin is concave, the anterior dorsal margin is convex.

Geographical distribution and habitat

The distribution area of ​​the inflated spatula stretches from northern Norway to the Mediterranean .

They dig in muddy and sandy soils from about 18 meters water depth to about 800 meters water depth.

Taxonomy

The species was founded by William Wood in 1815 as Mya convexa .

MolluscaBase gives the following synonyms: Thracia maravignae Aradas & Calcara, 1843, Thracia scheepmakeri Dunker, 1852, Thracia trigona Aradas, 1847 and Thracia ventricosa Philippi, 1844. Some authors also consider the common spatula ( Thracia pubescens ) to be synonymous . This view is not accepted.

supporting documents

literature

  • Fritz Gosselck, Alexander Darr, Jürgen HJ Jungbluth, Michael Zettler: common names for mollusks of the sea and brackish water in Germany. Mollusca, 27 (1): 3–32, 2009 PDF (p. 29)
  • Fritz Nordsieck : The European sea shells (Bivalvia). From the Arctic Ocean to Cape Verde, the Mediterranean Sea and the Black Sea. 256 p., Gustav Fischer Verlag, Stuttgart 1969 (p. 159/60)
  • Guido Poppe. Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 pp., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 137)

Web links

Individual evidence

  1. ↑ a b William Wood: General Conchology: Or, A description of shells, arranged according to the Linnean system, and illustrated with plates, drawn and colored from nature. 246 pp., 59 plates, John Boothe, London 1815. Online at Google Books (p. 92)
  2. ↑ MolluscaBase: Thracia convexa (W. Wood, 1815)
  3. ↑ Marine Species Identification Portal: MJ de Kluijver, SS Ingalsuo & RH de Bruyne: Mollusca of the North Sea